Routes - and Why I Prefer Developing my Hippocampus to my Quadriceps

It’s fairly easy for even a casual observer to spot what cycling does for some bits of my body. While I’m far less fit than I’d like to be, I boast thighs that some mature trees would be happy to call their trunks. Since moving to New York and cycling farther each day, I’ve also lost some weight, as testified to by the sag in my trousers’ waistbands below the belt loops.

I’ll probably never know, however, precisely what I’m doing to the posteriors of my hippocampi, two tiny glands on either side of my brain that help me to find my way around. I get just as much satisfaction, nevertheless, from the idea that I’m making them bigger, more complicated and more useful than they used to be as I do from my bulging thighs and slimming-if-still-overlarge waist.

 

The Invisible Visible Man's CaBi bike at Union Station:
mission accomplished

That satisfaction came home to me particularly forcefully this past week after I conquered my nervousness to have a go at cycling between Arlington, Virginia and my train home from Washington’s Union Station. I headed off tentatively on a Capital Bikeshare bike, worrying that my only rudimentary sense of the area’s geography would soon leave me hopelessly lost. I very nearly gave up immediately after getting the bike out of the docking station, alarmed at the bike’s handling when loaded with all my various bits of baggage.

An hour or so later, however, I was pushing the bike’s wheel into the Union Station docking station, feeling strangely elated. It was, it occurred to me, the kind of satisfaction that's soon going to be available to more people in New York, with the introduction of the Citibike bike share system. I’d tackled the mental puzzle of working out my way and reached a satisfactory conclusion.

My interest in the hippocampus dates back, however, to long before I ever set foot in the United States. I first heard of the brain structure while studying psychology at St Andrews University. I particularly associate it with a visit once with a friend to a room lined with cages full of rats. The friend was a PhD student working with the rats on neurophysiology, had gone in to check on them over the weekend and invited me along.

On the room’s ceiling, I could see the outline of a now-removed round disc. It marked, my friend told me, where Richard Morris, a neurophysiologist, had first conducted a famous experiment on the hippocampus’s role. He had set up a pool in the room with a hidden platform that the rats had to find. A video camera in the ceiling disc’s middle tracked their progress. Rats proved good at learning where the platform was. But, when Prof Morris injected a drug into their hippocampi to stop them working, they were no longer able reliably to locate it. The hippocampus seemed to organise their memory for direction.

The Jefferson Memorial, during my great, trans-Washington
bike ride. Yeah, the picture's squint. I took it seated on a bike.
Get used to it already.

I made a connection between the hippocampus and my getting about by bike when I heard about Eileen Maguire’s research on taxi drivers. In a series of studies, Prof Maguire – of University College London - has examined changes in the posterior hippocampus in London taxi drivers as they first learn the Knowledge – the test they have to pass on the city’s geography – then apply it. The posterior hippocampus – the rear part of the structure - tended to be bigger and more complex in drivers who had passed the Knowledge than in would-be drivers who had failed it, she found.

My brain, I recognised, was probably undergoing similar changes to the taxi drivers’. The gradual trial-and-error process of learning how best to get to a place – the frustration at missing that vital turning again, the fear at suddenly finding oneself unintentionally on an over-busy road, the satisfaction on finally getting a route right – were playing themselves out in my hippocampi. New neurons were growing and new connections were forming as I gradually built up a more solid picture of the best ways to get about.

Streets in the City of London: it may look a mess to you -
but the Invisible Visible Man's mental maps can help you
round this maze

The process, however, has been nothing like as clinical as a neurophysiological description might imply. I recall, for example, how, shortly after moving south from Edinburgh in 1997, I set off, cycle map in pocket, to work out my route from home in Brixton to my employer’s offices. The 4½ mile journey took me 45 minutes of missing turnings in my bike route, failing to understand how traffic flows worked and repeatedly checking the map.

Latterly in London, I could make it home on a good night in 20 minutes – albeit down busier main roads. My mental map of South London’s cycling routes could switch more smoothly and efficiently than any satellite navigation device. By the time I left London, I knew every pothole and manhole cover of many of the roads I’d cycled most often, preparing to avoid them well before I had reached them.

My mental map spread well beyond my regular commuting area. I’d feel a little surge of excitement if, for example, I got invited to some press event 15 miles from the office in Wembley. Why, I hardly ever got to use my carefully-memorised route out to that area, I’d think to myself. I was surprised and delighted one time when I found another reporter had made the same decision as I to cycle from Central London. We earnestly swapped thoughts on busy roads and helpful shortcuts.

 

The Shard: on my route to City Airport

It was my enthusiasm for the route that gave me a bias in favour of flying from London City Airport. My route for the 13 or so miles from my house to the airport – which distinguished itself by having good bike parking – was, I often felt, something of a work of art. I would pedal across the Thames, down Cable Street in the densely-packed East End, past Canary Wharf, then out into the grim housing estates of still working-class docklands. I would encounter evidence of every period in London’s history, from the Romans to the new Shard skyscraper. There can be few better ways of feeling at one with a city than to know intimately a route like the one I used to reach City Airport. It would take me from a beautiful but obscure quiet Georgian Square then out across the internationally-recognised landmark of Tower Bridge.

I’ve experienced something similar in New York. When apartment hunting, I found myself a couple of times nastily off course – on the wrong side of a busy expressway from where I wanted to be or careering down a six-lane avenue of scary, fast-moving traffic. But I know my mental map of the city is slowly but surely stitching together, somewhere in the back of my hippocampi. Without thought, I head north a couple of blocks to avoid the most constricted sections of W54 street most mornings, then south again before the office. I’ve been trying out a route up the east side bike path some other mornings. I take joy in now knowing the Lexington-Park-Madison-5th sequence of avenues I cross as I head to work. But I shun that route in the evenings, well aware, after previous experience, of the miseries of trying to head southbound on 2^nd avenue.

The Empire State Building in pink:
cycling to photograph it was more fun for me than a party

I felt that same sense of having access to secrets of the city closed to others when, one night recently, my employer organised on the Upper East Side a party to celebrate its 125^th anniversary. As others headed off afterwards to an after-party, I made excuses – but knew my main motivation was my desire to try the way home I’d crafted in my head. Before long, I was bowling down from the top of the Queensboro Bridge’s bike path, which I last used regularly in the aftermath of Superstorm Sandy. Then I was into Queens and navigating streets under elevated subway lines so romantically urban they should have had a permanent Chicago Blues soundtrack.

 

I looked across as I headed down the East River at the Empire State building, lit up pink in honour of the anniversary. I was, I felt sure, enjoying myself far more on this solitary exploration of the city than anyone yelling at a colleague to be heard over the music at the party.

Which brings me back to Washington.

The US Capitol: how to get there by bike is now fixed in
the Invisible Visible Man's hippocampi

Whatever my initial misgivings, they disappeared immediately I found myself on a bike path by the Potomac and catching my first glimpse of the Jefferson memorial and US capitol sitting on the other side. I sped – as much as one can on a bikeshare bike – over the 14^th street Bridge and slowly worked out the best route along the National Mall. A little bit of guesswork once I’d got north of Pennsylvania Avenue and I was finally at the station, embarrassed to find myself feeling little less elated than Edmund Hillary can have felt on his first conquest of Everest.

But there were, it came to me, few satisfactions in life more total than completing such a journey. I had set out to tackle a challenge and, as I pushed the bike back into the docking station, comprehensively conquered it. I had made the journey entirely on my own resources. And, somewhere in my two hippocampi, just as those rats in St Andrews learnt where the platform was, my mental maps for cycling in Washington and northern Virginia were starting to form.